AFFORESTATION OF CATCHMENT AREAS 101 
forestry work is that it is mainly done in winter, when the 
demand for ordinary agricultural labour is slack. A com- 
bination, in any part of the country, of afforestation and 
farming will provide continuous labour to the rural popula- 
tion, and automatically get rid of the unemployment problem. 
A complete account of the Washburn Valley afforesta- 
tion scheme by Mr. A. Pope, the forester in charge, appeared 
in Quarterly Journal of Forestry, vii. pp. 190-207 (1914), 
with map, now reproduced (Fig. 12), and should be read 
by those interested in planting on land of the varied char- 
acter that is usually met with in upland gathering grounds. 
The water in the Swinsty reservoir is connected by four 
mains with Eccup reservoir, south of Harewood Park, whence 
it is conveyed to filter beds at Weetwood, near Leeds. 
In addition to the Washburn area, the Leeds Corpora- 
tion have several other waterworks schemes, not yet com- 
pleted, as follows: 
Laver Valley, west of Ripon, catchment area of 7334 
acres, of which 4000 acres have been acquired by the Cor- 
poration. It is proposed to build on this area two reser- 
voirs, one at Laverton for compensation water, and another at 
Carlesmoor, a mile higher up the stream, for domestic supply. 
Burn Valley, catchment area of 5886 acres, with a con- 
templated reservoir just below Colsterdale village, west of 
Masham. 
Pott Beck Valley, catchment area of 4702 acres, with 
Leighton reservoir, now in course of construction. This 
area derives its supply from the lower part of the Pott 
Beck Valley, Grimes Gill, and Spruce Gill Beck, and is 
contiguous with the catchment area of Roundhill reservoir, 
belonging to Harrogate, which gets its water from the upper 
part of the Pott Beck Valley. 
Birmingham has the largest watershed of all the Cor- 
porations, 45,562 acres, situated in the, Elan and Claerwen 
valleys in Radnorshire and Breconshire. It ranges in 
altitude from 822 feet, the level of the Caban Coch reser- 
voir, to 2115 feet, the average elevation being about 1350 
